Come impostare il RootViewController con Swift, iOS 7

Question

voglio impostare il RootViewController nel delegato app ..

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: NSDictionary?) -> Bool { 

    var rootView: MyRootViewController = MyRootViewController() 
    //Code to set this viewController as the root view?? 


    return true 

} 

Answer 1

si può fare qualcosa di simile.

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: NSDictionary?) -> Bool { 

    var rootView: MyRootViewController = MyRootViewController() 

    if let window = self.window{ 
      window.rootViewController = rootView 
    } 

    return true 
} 

Answer 2

Per visualizzarlo ci sono alcune cose che devi fare se non stai usando uno storyboard. All'interno di AppDelegate all'interno dell'applicazione della funzione.

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool { 
    // Override point for customization after application launch. 

    let frame = UIScreen.mainScreen().bounds 
    window = UIWindow(frame: frame) 

    let itemsViewControler: UITableViewController = BNRItemsViewController() 
    if let window = self.window{ 
     window.rootViewController = itemsViewControler 
     window.makeKeyAndVisible() 
    } 

    return true 
} 

Answer 3

Se si utilizza uno storyboard e si desidera impostare la vostra RootViewController a livello di codice, prima assicurarsi che il ViewController ha un ID Storyboard in Impostazioni Identità. Poi nel AppDelegate effettuare le seguenti operazioni:

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool { 

    // get your storyboard 
    let storyboard = UIStoryboard(name: "Main", bundle: nil) 

    // instantiate your desired ViewController 
    let rootController = storyboard.instantiateViewControllerWithIdentifier("MyViewController") as! UIViewController 

    // Because self.window is an optional you should check it's value first and assign your rootViewController 
    if let window = self.window { 
     window.rootViewController = rootController 
    } 

    return true 
} 

Answer 4

Swift 2.0:

var window: UIWindow? 
var storyboard:UIStoryboard? 

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool { 

    window = UIWindow(frame: UIScreen.mainScreen().bounds) 
    window?.makeKeyAndVisible() 

    storyboard = UIStoryboard(name: "Main", bundle: nil) 
    let rootController = storyboard!.instantiateViewControllerWithIdentifier("secondVCID") 

    if let window = self.window { 
    window.rootViewController = rootController 
    } 

Answer 5

if let tabBarController = self.window!.rootViewController as? UITabBarController 
    { 
     tabBarController.selectedIndex = 0 
    }